@article{ref1,
title="Pistol regulation: Its principles and history. Part I",
journal="American journal of police science",
year="1931",
author="Frederick, KT",
volume="2",
number="5",
pages="440-451",
abstract="[Abstract unavailable]  <p>Language: en</p>",
language="en",
issn="1547-6154",
doi="",
url="http://dx.doi.org/"
}